Electrical condenser



21 1927.' June w. H. HUTH ELECTRICAL CONDENSER Filed Nov. 19. 1925 Patented June 21, 1927.

4PATENT OFFICE.

wurm: H. nuria, or cnicaeo, more ELECTBIQAL CONDENSED.

application mea ummm is, 192s. semi no. 70,053.

This invention relates to electricall condensers, andmore particularly to those which are adjustable, to regulate the capacity thereof, and more especially to those which are adapted to be used for tuning pur oses in radio receiving apparatus.

Glenerally stated, therefore, the object of the invention is to provide a novel and simple and improved construction of condenser, which can be manufactured and sold at a comparatively small cost of production, and which can be adjusted, preferably before leaving the factory, to insure the exact capacity desired, and which can then be incorporatec" in radio or other apparatus, either by the manufacturer of such apparatus or by the user thereof, for any suitable or desired purpose.

It is also an object to provide certain details and features of construction in combinations tending to increasel the general eiciency and the desirability of an electrical condenser of this particular character.

To the foregoing and other useful ends, the invention consists in matters hereinafter set forth and claimed and shown in the accompanying drawings in which:

Fig. 1 is a transverse section on line 1--1 in Fig. 2, showing a condenser embodying the principles of the invention.

Fig. 2 is a longitudinal or axial section on line 2-2 in Fig. 1.

As thus illustrated, the invention coniprises a two-part casing of fibre or other suitable insulating material, comprising the section l and the section 2,` which are fiat and have annular edges, and which are screwed together by means of screw threads 3 formed on their en aging portions, thus roviding a flat roun box having a chaun r 4 therein.

A bushing 5 of fibreor metal or other material, is preferably inserted through the section 1, in the manner shown, to extend through the wall or other su port 6, the end of this bushin being thre ed to receive a nut 7 b whic the condenser as a whole is detacha ly clamped upon the said wall. A screw 8 is inserted through lthe bushing 5, in the manner shown, and is adapted to bear inst the insulation 9 on the metal plate glwhich. latter has the radially arranged the inner surface of elbows,

bear against the mica or other portions 11 and 11 which bear against the section 1, at their and which at their extreme ends plate 12 which yforms the dielectric of the condenser.

The other metal plate 13 of the condenser is disposed underneath the mica plate 12 and held in place by a metal stud 14 which has a terminal 15 as shown. The portion 11 has an extension 16 to serve as the other terminal of the condenser, and by attaching circuit wires to the terminals 15 and 16the condenser can be incorporated in any desired circuit. The plate 10 is of more or less springy or resilient metal, and can be moved toward and away from the plate 13 by the adjustment of the screw 8, the portions 11 and l1 bendin one Way or the other for this pur ose. ii this wa the capacity of the con enser can be adjusted or changed or regulated, to suit lthe requirements, preferably before the condenser leaves the factory. Of course, the user can, by applying a screw driver to the head of the screw 8, adjust denser, but the intent and purpose is more especially with reference to the desirability of roviding a condenser which can be careful y adjusted or regulated before it'leaves the factory, and which will not then need or require any further adjustment or regulation by the user, whereby a comparatively chea and yet eiiicient condenser is provide for any desired purpose, as distinct from condensers which are designed and intended to be adjusted by the user for ordinar tunin i' or other purposes.

he con enser shown and described is susceptible of manufacture at a comparatively low cost of production, is easil assembled in the manner shown, and is o a compact and unitary form, being adapted to be easily and conveniently incorporated in any radio receiving apparatus, where it is necessary and desirable to interor regulate the conl or in anyl apparatus pose the condenser, for any desired purpose,

at some point in an electrical circuit.

Furthermore, it will be seen that the construction shown and described has the advantage of being adjustable, to Vregulate the capacity, Without distortion of the plate 10, and without distortion of the fiat and disclike body portion thereof, whereby the dis tance between the two flat plates of the condenser inay be varied or changed in a desirable and effective manner, without distortion of anything more than' the legs or .Y a

arms 11 and 11, and such distortion is not calculated to interfere in any way with 4the action and efficiency of the condenser.

Moreover, with the construction shown and described, it will be seen that the condenser is of such character that the appl1cation of a screw driver to the head of the screw 8, and the proximity of 'the hand of the person doing the work, will only have a minimum eii'ect on the condenser, and will not interfere, accurate adjustment of the condenser in the manner desired. In some condensers, as is well known, vthe construction is such that the application of a screw driver or other tool, for the adjustment of the condenser, and even the proximity of the person doing the work, are sufiicieiit to interfere with the proper adjustment ot the condenser, to an extent that the adjustment obtained is not permanent, but changes when the person doing the work has moved away a distance. But in the construction shown and described the object is to avoid this diiiiculty in so far as possible, or to minimize the diiiiculty, and to thus provide a condenser in which the capacity will be substantially 'the same after the adjustment is completed and after the person doing the work has departed; and, with the construction shown and described, the condenser plates and dielectric are prac- 'ticall sealed in a dust-tight and waterproc casing, and in the construction shown the chamber 4 can be made proof against the entrance of dust or dampness, and may even be made practically air-tight, without interfering in any way with the facility with which 'the condenser may be adjusted after it is assembled and completed.

With the construction shown and described as illustrative of the invention, the outer edges of the plate 10 are free, and distortion of this plate is not necessar for adjustment to regulate the capacity o the condenser, as the only distortion necessary is that of the arms 11 in the manner ex lained. As the terminal 16 is an extension o one of said arms, and is extended through the sec' tion 2 of the casing, it follows that the two condenser plates and the dielectric form a structural unit with the section 2 of the casing, and can be removed as a unit, when desired. On the other hand, the adjusting means and the section 1 of the casing form a separate structural unit. The plate 10 is in no way dependent upon the adjusting means for anything but the adjustment of the condenser to regulate the capacity thereof, the positioning means 11 being suilicient to posion the plate 10 in lthe condenser, and being entirely independent of the adjustingmeans. o, of course, the plates and dielectric are heid against rotation in the condenser, and these elements do not rotate when the screw is rotated to adjust the condenser.

Without disclaiming anything, and without prejudice to any novelty disclosed, what claim as my inventionis:

at least not seriously, with the 1. In an electrical condenser, the combination of a housing therefor comprising two casing sections secured together to provide a chamber between them, condenser plates and dielectric means in said chamber, held against rotation, free at its outer edges instrumentalities to movably position said one plate in said chamber, so that the one plate is movable while remaining fiat, and mechanism for regulating the capacity of the condenser, disposed entirely at one side of the movable plate, extending axially through one section of the casing, operative by pressure on the movable plate to vary the distance between the plates.

2. A structure as specified in claim 1, said one plate having springy arm portions forming said instrumentalities for positioning the plate in the condenser, and saidadjusting mechanism being operative to exert ressure on the center ot the plate and to ex said s ringy portions to permit movement of the p ate axially of the condenser, whereby distortion of t e main body of the plate is not necessary for said adjustment.

3. A structure as specified in claim 1the one plate having radial springy positioning portions forming said instrumentalities, with insulation between this plate and said adjusting mechanism, another plate being stationary and fastened to one section ofthe casing, and the dielectric between the two plates being held in place by said sprin portions.

4. A structure as specified in c aim 1, said mechanism comprising an axially arranged rotary adjusting screw, and means whereby rotation of said screw will cause endwise movement thereof, said one condenser plate havin insulating engagement with the inner end o said screw, and the outer end of said screw having a head for the adjustment thereof by a screw driver or other means.

5. An electrical condenser comprising metal plates and dielectric held against rotation, at least onev of said plates having s rin positioning portions for positioning t e p ate with its outer ed esjfree, and adjusting mechanism disposed entirely at one side of the one plate and comprising an axially movable rotary screw for causing the iiexing of said sprin portions, thereb to permit movement of t e vplate axially o the condenser, to regulate the capacity of the condenser.

6. A structure as specified in claim 5, comprising a dielectric plate held in place by said springy portions, the plate being cut back a distance from its outer edges to form said s ringy portion.

7. structure as specified in claim 5, comprising a casing of'insulation for the condenser, and an axial in which bushing ing provisions for bushing for said casing, said screw is threaded havthe insertion of said bushwitli one plate movable and having provisions for` the ms position on said 8. 4A structure as specified in claim 5, com-y casing of insulation for the confor said casing, vertion of said bushing through a wall or support, and for thus clamping the condenser 1n position on said wall or support, together with an adjusting screw extending axially through said bushing, forming said adjusting mechanism, the late having said springy portions having msulating engagement with the inner end of said screw.

9. A condenser comprisin a casing comprising separately connecte sections, formmg a chamber between them, a metal condenser plate secured flatwise in one section, the two sections being of insulating material, a terminal for said plate on the outer surface of the section to which it is secured, a dielectric in position ilatwise against said plate, a movable metal plate cut back a distance from its outer edges, to form springy arms to movably position this plate in said chamber, with said dielectric Ibetween the two plates, whereby the outer edges of the prisingI a denser, and an axial bushln ort, and .for thus means being separa plate, whereby `and the other section of the movable plate are free, and rotary adjusting means carried by the other section and operable by axial movement thereof when rotated for exerting pressure u on the central portion of sai movable p ate, thereby to iex said arms and cause relative movement of the two plates toward and away 4from each other said movable plate being entirely insulated within said chamber.

10. A structure as specified in claim 9, one of said arms being extended outwardly through the section to which the stationary late 1s attached, so that this particular arm olds the movable plate and the dielectric together in the casin section, said adjusting le from said movable both plates and the dielectric form a structural unit with the one section of the casing, while said adjusting means casing form a se arate structural unit, the springy arm w ich is extended through the casing being adapted for use as the terminal of said movable plate.

S eciiication signed vem er, 1925.

this v17th day of No- WALTER H. HUTH. 

